I was specifically addressing what @Suicidal Emo Panda said. They said that the harder you work, the more benefits you get. That is, working for a wage will always get you more money proportionally to how much you work. That still holds up regardless of the tax rate. (Unless it's 100%, of course.)
Additionally, I wouldn't regard investment as work, per se. It's more comparable to gambling.
(I mean, I'm not putting it down. It's admirable and there's societal value in it, but I think the motivations are different from ordinary wage-based work.)
Yeah, but @Suicidal Emo Panda was talking about taxing the rich. The rich generally don't get paid ordinary wages. They are shareholders in the company.